Question: If X is a normal random variable with a mean of 78 and a standard deviation of 5, find the following probabilities: a) P (

If X is a normal random variable with a mean of 78 and a standard deviation of 5, find the following probabilities:

a)P(X 78)

b)P(X 87)

c)P(X 91)

d)P(70 X 77)

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